1) Air coming out of your butthole sometimes accompanied with feces when you have the flu.
2) An excellent yet extremely funny way to get rid of a blind date or just a person you don't know or like in that matter.
3) A good reason to make fun of someone.
4) A good reason to be friends with someone.
5) The possibilities are endless!

Gosh where to start?
Well first off farting is a great way to find things out about your friends. Try saying "hey i just farted" then watch to see if their nostrils flare up. you will automatically know if your friend is a fart-sniffer.
Second: farting can be used as jokes. For example "Question: why do farts smell?" "Answer: that's easy, farts smell because that way the def people can enjoy them too!!"